Allocated but unannounced space
Every block here was allocated or assigned by a regional internet registry, and none of them appeared in any routing table we collected at our last snapshot — neither as a route of their own, nor covered by a larger announcement, nor carved up into more specifics.
“Unannounced” does not mean “unused”
Plenty of allocated space is deliberately kept off the public internet: private interconnects, lab and lawful-intercept ranges, networks reachable only inside one operator, and space held in reserve. Some of it is announced somewhere our collectors cannot see, which is a limit of our vantage points rather than a fact about the block.
It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today. Nothing on this page means a block is unallocated, available, or free to announce.
Browse by registry
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks in Australia
2,385 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.33.245.0/24 | 256 | APNIC |  AU | 25th Oct 1996 |
| 203.33.30.0/24 | 256 | APNIC | AU | 10th Oct 1996 |
| 203.33.42.0/24 | 256 | APNIC | AU | 10th Oct 1996 |
| 203.33.69.0/24 | 256 | APNIC | AU | 11th Oct 1996 |
| 203.34.101.0/24 | 256 | APNIC | AU | 12th Nov 1996 |
| 203.34.111.0/24 | 256 | APNIC | AU | 12th Nov 1996 |
| 203.34.12.0/23 | 512 | APNIC | AU | 29th Oct 1996 |
| 203.34.141.0/24 | 256 | APNIC | AU | 12th Nov 1996 |
| 203.34.181.0/24 | 256 | APNIC | AU | 20th Nov 1996 |
| 203.34.2.0/23 | 512 | APNIC | AU | 28th Oct 1996 |
| 203.34.243.0/24 | 256 | APNIC | AU | 22nd Nov 1996 |
| 203.34.26.0/24 | 256 | APNIC | AU | 29th Oct 1996 |
| 203.34.33.0/24 | 256 | APNIC | AU | 2nd Sept 1994 |
| 203.34.61.0/24 | 256 | APNIC | AU | 1st Nov 1996 |
| 203.34.64.0/24 | 256 | APNIC | AU | 4th Nov 1996 |
| 203.34.72.0/24 | 256 | APNIC | AU | 6th Nov 1996 |
| 203.34.88.0/24 | 256 | APNIC | AU | 6th Nov 1996 |
| 203.4.0.0/17 | 32.8k | APNIC | AU | 28th Jan 1994 |
| 203.4.161.0/24 | 256 | APNIC | AU | 7th Apr 1994 |
| 203.4.176.0/22 | 1k | APNIC | AU | 13th Apr 1994 |
| 203.4.181.0/24 | 256 | APNIC | AU | 15th Apr 1994 |
| 203.4.185.0/24 | 256 | APNIC | AU | 19th Apr 1994 |
| 203.4.204.0/24 | 256 | APNIC | AU | 22nd Apr 1994 |
| 203.4.240.0/21 | 2k | APNIC | AU | 27th Apr 1994 |
| 203.5.119.0/24 | 256 | APNIC | AU | 9th Jun 1994 |
| 203.5.160.0/21 | 2k | APNIC | AU | 20th Jun 1994 |
| 203.5.18.0/24 | 256 | APNIC | AU | 19th May 1994 |
| 203.5.193.0/24 | 256 | APNIC | AU | 24th Jun 1994 |
| 203.5.211.0/24 | 256 | APNIC | AU | 30th Jun 1994 |
| 203.5.220.0/22 | 1k | APNIC | AU | 9th Nov 2007 |
| 203.5.224.0/20 | 4.1k | APNIC | AU | 8th Jul 1994 |
| 203.5.240.0/22 | 1k | APNIC | AU | 8th Jul 1994 |
| 203.5.25.0/24 | 256 | APNIC | AU | 19th May 1994 |
| 203.5.40.0/22 | 1k | APNIC | AU | 27th Sept 2007 |
| 203.5.45.0/24 | 256 | APNIC | AU | 27th Sept 2007 |
| 203.5.73.0/24 | 256 | APNIC | AU | 27th May 1994 |
| 203.5.96.0/21 | 2k | APNIC | AU | 27th May 1994 |
| 203.55.115.0/24 | 256 | APNIC | AU | 9th Dec 1996 |
| 203.55.120.0/23 | 512 | APNIC | AU | 11th Dec 1996 |
| 203.55.130.0/24 | 256 | APNIC | AU | 13th Dec 1996 |
| 203.55.144.0/24 | 256 | APNIC | AU | 13th Dec 1996 |
| 203.55.156.0/24 | 256 | APNIC | AU | 13th Dec 1996 |
| 203.55.19.0/24 | 256 | APNIC | AU | 29th Nov 1996 |
| 203.55.216.0/23 | 512 | APNIC | AU | 14th Jan 1997 |
| 203.55.220.0/24 | 256 | APNIC | AU | 15th Jan 1997 |
| 203.55.226.0/24 | 256 | APNIC | AU | 15th Jan 1997 |
| 203.55.28.0/23 | 512 | APNIC | AU | 29th Nov 1996 |
| 203.55.39.0/24 | 256 | APNIC | AU | 29th Nov 1996 |
| 203.55.42.0/24 | 256 | APNIC | AU | 29th Nov 1996 |
| 203.55.45.0/24 | 256 | APNIC | AU | 3rd Dec 1996 |